The Great Barrier Reef is set off the coast of Queensland in the Coral Sea. There’s a reason it appears on so many bucket lists. This immense natural phenomenon – so colossal it can be seen from outer space – is one of the seven wonders of the natural world. From getting up close and personal with the abundant marine life to taking in spectacular views of the reef by air, the list of incredible experiences to be had in this area is almost endless. The palm-fringed Whitsunday Islands are an ideal base station – although they’re so marvellous in themselves you may find it difficult to leave.